共查询到19条相似文献,搜索用时 95 毫秒
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图的特征多项式有许多性质,本文给出了特征多项式的指数表达式,特征多项式的导数的几个不同表达式以及高阶导数的图论意义。 相似文献
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2017年, Nikiforov首次提出研究图$G$的$A\alpha$-矩阵, 其定义为:$A\alpha(G)=\alpha D(G)+(1-\alpha)A(G) (\alpha\in [0,1])$, 其中$A(G)$和$D(G)$分别为图$G$的邻接矩阵和度对角矩阵. 设$F_n$和$M_n$分别为圈状六角系统和M\"{o}bius带状六角系统图. 根据循环矩阵的行列式和特征值, 本文首先给出图$F_n$和$M_n$的$A\alph$-特征多项式和$A\alpha$-谱, 进一步得到图$F_n$和$M_n$的$A\alpha$-能量的上界. 相似文献
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微分多项式系统的近微分特征列集 总被引:12,自引:0,他引:12
本文对微分多项式系统的近微分特征列集与微分特征列集之间的一些关系进行了研究,给出了在某些条件下近微分特征列集是微分特征列集的结论,从而对微分多项式系统特征列集理论(吴方法)进行了改进,并且建立的算法较大地提高了计算微分特征列集的效率. 相似文献
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具有一个高阶奇点和两个零特征根的一类多项式系统 总被引:2,自引:0,他引:2
韩玉良 《高校应用数学学报(A辑)》1996,(3):269-276
本文讨论了具有一个高阶奇点和两个零特征根的一类2n+1次系统,证明了这类系统可以存在两个n阶细焦点,给出极限存在性和不存在性的条件,并证明了无穷远分界线环的存在性。 相似文献
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本文通过递推关系 ,直接给出求三对角矩阵特征多项式的一种简便方法 .该方法具有操作简单 ,计算量小的特点 .并给出算例 . 相似文献
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In this article, we study some algebraic and geometrical properties of polynomial numerical hulls of matrix polynomials and joint polynomial numerical hulls of a finite family of matrices (possibly the coefficients of a matrix polynomial). Also, we study polynomial numerical hulls of basic A-factor block circulant matrices. These are block companion matrices of particular simple monic matrix polynomials. By studying the polynomial numerical hulls of the Kronecker product of two matrices, we characterize the polynomial numerical hulls of unitary basic A-factor block circulant matrices. 相似文献
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Wiener Index of Hexagonal Systems 总被引:19,自引:0,他引:19
The Wiener index W is the sum of distances between all pairs of vertices of a (connected) graph. Hexagonal systems (HS's) are a special type of plane graphs in which all faces are bounded by hexagons. These provide a graph representation of benzenoid hydrocarbons and thus find applications in chemistry. The paper outlines the results known for W of the HS: method for computation of W, expressions relating W with the structure of the respective HS, results on HS's extremal w.r.t. W, and on integers that cannot be the W-values of HS's. A few open problems are mentioned. The chemical applications of the results presented are explained in detail. 相似文献
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一类特殊的对称的块循环矩阵的特征值 总被引:2,自引:0,他引:2
WangLigong LiXueliang HoedeC 《高校应用数学学报(英文版)》2004,19(1):17-26
In this paper, the spectrum and characteristic polynomial for a special kind of symmetric block circulant matrices are given. 相似文献
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提出了任意域上鳞状循环因子矩阵 ,利用多项式环的理想的Go bner基的算法给出了任意域上鳞状循环因子矩阵的极小多项式和公共极小多项式的一种算法 .同时给出了这类矩阵逆矩阵的一种求法 .在有理数域或模素数剩余类域上 ,这一算法可由代数系统软件Co CoA4 .0实现 .数值例子说明了算法的有效性 相似文献
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Given a graph G with characteristic polynomial ϕ(t), we consider the ML-decomposition ϕ(t) = q
1(t)q
2(t)2 ... q
m
(t)m, where each q
i
(t) is an integral polynomial and the roots of ϕ(t) with multiplicity j are exactly the roots of q
j
(t). We give an algorithm to construct the polynomials q
i
(t) and describe some relations of their coefficients with other combinatorial invariants of G. In particular, we get new bounds for the energy E(G) =
|λi| of G, where λ1, λ2, ..., λn are the eigenvalues of G (with multiplicity). Most of the results are proved for the more general situation of a Hermitian matrix whose characteristic
polynomial has integral coefficients.
This work was done during a visit of the second named author to UNAM. 相似文献